APW7057

APW7057 High Power Step-Down Synchronous DC/DC Controller Features Operates from +5V Input 0.8V Internal Reference Voltage - ±1.5% Accuracy Over Line, Load and Temp. 0.8V to V Output Range CC Full Duty Cycle Range - 0% to 100% Internal Loop Compensation Internal Soft Start - Typical 2ms Programmable Over-Current Protection - Lossless Sensing Using MOSFET RDS (ON) Under-Voltage Protection Drives External N-Channel MOSFETs Shutdown Control Small SOP-8 Package Applications Motherboard Graphics Cards Cable or DSL Modems, Set Top Boxes DSP Supplies Memory Supplies 5V Input DC-DC Regulators Distributed Power Supplies General Description The APW7057 is a 300kHz constant frequency voltage mode synchronous switching controller that drives external N-channel MOSFETs. When the input supply drops close to output, the upper MOSFET remains on, achieving 100% duty cycle. Internal loop compensation is optimized for f...